Collared Treepie

An entirely black mountain-dwelling drongo with a forked tail and a dark red eye. Typically found singly or in pairs within canopy or upper understory of montane forest, where it regularly accompanies mixed-species flocks. Told from the similar Sulawesi form of Spangled Drongo by its dark eye and less flared outer tail feathers. Sulawesi Drongo also prefers higher elevations. Simple song includes metallic, strident myna-like “chew” notes, often strung together, as well as harsher, lower-pitched “cheewk” notes.

A streak-breasted oriole with a rather long, lipstick-pink bill. Male is yellow with a glossy black hood and dark wings. Female is olive-green above. Both sexes have dark red eyes. On Borneo absent from the northern parts of the island, where replaced by the very similar Ventriloquial Oriole. Inhabits lowland and hill forests and forest edges, typically moving in the upper levels of the forest. Sometimes found singly, sometimes in pairs or mixed flocks. Song is short but fluidly melodic, often with the last note stretched out. Gives a harsh, jay-like “chew!”.

Large and distinctive dark eagle of forested mountains and hills. Adults appear all dark from a distance, but closer inspection reveals pale barring on the primaries, secondaries, and undertail, as well as a bright yellow bill and feet. Readily separated from other large birds of prey in range by structure as well as coloration; Black Eagles have broad wings with distinct “fingers”(emarginated primaries) in the tip, as well as a long tail that is fan-shaped when open and slightly wedge-shaped when closed.